You reported that mpeg2video lowres support is missing (I originally read only the body of the ticket, where it only says "lowres was removed", I did not understand the problem because lowres did exist at least for mpeg4 and dvvideo at the time you reported the problem).
Since yesterday, mpeg2video lowres works fine here.

If you believe there still is an issue, please provide a failing command line together with complete, uncut output (you should have done this originally).

Command line of what? this is a libavcodec issue and about features dropped from it.

yes, mpeg2video lowres support was re-enabled. But what about lowres support for all the other codecs that were removed in that same commit.
Those were not reverted, i have listed above all the codecs that suddenly saw their lowres support dropped.